Polarized-magnet device.



No. 825,406. PATENTED JULY 10, 1906. M. K. MOGRATH.

POLARIZED MAGNET DEVICE.

APPLICATION FILED JAN. 11. 1904.

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MAURICE K. MGGRATH, OF CHICAGO, ILLINOIS, ASSIGNOR TO WESTERN.

ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A, CORPORATION OF ILLINOIS.

Specification of Letters Patent.

POLARIZED-MAGNET DEVICE.

Patented July 10, 1906.

Applicationfiled J y 11. 1904- Serial No- 188,428.

To aZZ whom it may concern.

Be it known that I, MAURICE K. MOGRATH,

' a citizen of-the United States, residing at Chicago, in the county of Cook and State of Illiwhich is relatively movable therein.

1101s, have invented a certain new and useful Improvement in Polarized-Magnet Devices, of which the following is a full, clear, concise, and exact description;

My invention relates to a polarized-magnet device of the kind which is used to operate telephone signal bells or ringers or for polariz ed rela s; and its object is toprovide an improve device of this character which will re uire but a single magnetizing-helix and Wi 1 be hi hly efiicient in operation and cheap and simp e to manufacture.

I will describe my invention by reference to the accompanying drawings, in Which Figure 1 is a bottom view of my improved polarized-magnet device. Fig. 2 is an end view thereof, and Fig. 3 is a vertical sectional view of the device.

The same letters of reference are used to desiglnate the same parts wherever they are s own.

In the device shown a single magnet-helix a is provided surrounding a soft-iron corp l'i),

e core is pivoted to rock u on its'axis from side to side and carries so t iron lateral ex tensions b b.

As shown, the magnet cis of the well-known horseshoe shape and the united by a non-magnetic ridge-piece d, in which one end of the core is pivoted. The

other end of said core may be pivoted at the yoke portion of the "ma net, said ,core lying etween and parallel with the arms of the magnet. For the sake of compactness the core is mounted in the same lane as the poles of the magnet. The latera extensions 1) b of the core are in o sition to be attracted or repelled by the pofes respectively of the magnet, which are on either side thereof, whereby the core is turned upon its axis to one side or the other, dependent on the direction of the current through the helix. Said extensions 1) b form, in effect, a T-sha ed extensionin magnetic relation to the po es of the horseshoe-magnet. Said helix is supported between the legs of the permanent magnet by a U-shaped bracket e, secured to the yoke of the permanent magnet, the QJIHS of said bracket being secured to one of the inpoles thereof are sulating-heads of the helix-spool on opposite sides of the core. The pin or screw f, which secures the bracket to the magnet-yoke, serves also as a pivotal mounting for one end of the core b.

Two gongsg g are illustrated in Figs. 1 and 2 in osition to be struck by a tapper t, carried y the pivoted core I).

When'a current is passed through the helix a, the core 6, including the lateral extensions 1), is magnetized, the polarity of the end carrying said extensions depending, of course, upon the direction in which the current circulates in the helix around it. The horseshoe-magnet presenting a positive pole on one side of said core extension and a negative pole on the other side said extension if given, say, a positive polarity by the magnetizing-helix will be attracted by the negative pole and repelled by the positive. A reversal of current in the helix will reverse the polarity of the coreextension, which will thereupon be attracted to the positive pole and repelled by the negative. The core will thus be turned axially to one side or the other as often as the current flowing in the helix is reversed. An alternating current, such as is used for signaling purposes in telephoneexchange systems, when passed through the helix a Wi I' produce a rapid vibration-of the core and cause the tapper to strike alternately the gongs g g;

It will be apparent that by means of my invention I have been ableto produce a device which is very compact and self-contained, which will operate with great efficiency, and which is simple'and cheap to manufacture.

I claim 1. The combination with a permanent horseshoemagnet, of a soft-iron core lying parallel withthe arms of said magnet, pivotal mountings for said core permitting the same to rock on its axis, a T-shaped soft-iron extension from said core in magnetic relation with the poles of said horseshoe-magnet re spectively, and a stationary magnetizing-helix supported by said magnet and surround- I net, of a stationary magnetizing-helix supported between the legs of said magnet, a non-magnetic bridge-piece uniting the poles of said magnet, a core lying parallel with said magnet-legs, and surrounded by said helix, said core being pivoted at one end at the yoke of the magnet and at the other end in said bridge-piece to rotate axially, lateral extensions of said core, in position to be attracted or repelled by the poles of said magnet according to the polarity imparted to said core by said helix, and mechanism operated by said extensions in their movement.

3. The combination with a permanent horseshoe-magnet, of a bracket secured to the yoke of said magnet, a magnetizing-helix supported by said bracket between the legs of said magnet, a core lying parallel with said .magiget-legs and surrounded by said helix, 2. n n-magnetic bridge-piece uniting the poles of said magnet, said core being pivoted at one end of the yoke of the permanent magnet and at the other end in said bridge-piece to -rotate axially independent of said helix, and extensions of said core in position to be attracted or repelled by the poles of said magnet.

4 In a polarized bell, the combination with a permanent horseshoe-magnet, of a nonmagnetic bridge-piece uniting the poles thereof, a soft-iron core having one end pivoted in said bridge-piece, and the other end pivoted at the-yoke portion of the horseshoe-magnet, soft iron lateral extensions of said core-in position to be attracted or repelled by the poles respectively of said horseshoe-magnet to rock said core upon its axis from side to side, a stationary helix surrounding said core, said core being free to move axially.therein, a tapper carried by the core, and gongs against which said tapper is adapted to strike in vibrating.

5. In a polarized magnetic device, the combination with a permanent horseshoe-magnet, of a bracket, a pin securing said bracket to the yoke of the permanent magnet and proj ecting beyond said bracket, a stationary magnetizing-helix supported by said bracket between the legs of said magnet, a nonrn'agnetic bridge-piece uniting the poles of said magnet, a core lying parallel with said magnet-legs and surrounded by said helix, said core being pivoted at one end upon the aforesaid pin, and at the other end in said bridgepiece to rotate axially, lateral extensions of said core in position to be attracted or repelled by the poles of said magnet according to the polarity imparted to said core by said helix, and mechanism operated by said ex- I tensions in their movement.

6. The combination with a permanent horseshoe-magnet, of acore lying parallel with the arms; of said magnet, a nonmag netic bridge-piece uniting the poles of said magnet, one end of said core being ivoted insaid bridge-piece, the other end 0 said core being pivoted at the yoke portion of said magnet, extensions of said core in magnetic relation tothe poles or said magnet, and-a stationary magnetizing-helix supported by said magnet and surrounding said core.

In witness whereof I'hereunto subscribe my name this 3d day of December, A. D. 1903.

MAURICE K. MGGRATH.

Witnesses:

EDWIN H. SMYTHE, FREDERICK A. WATKINS. 

